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xenocara/dist/Mesa/progs/osdemos/ostest1.c

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/*
* Test OSMesa interface at 8, 16 and 32 bits/channel.
*
* Usage: osdemo [options]
*
* Options:
* -f generate image files
* -g render gradient and print color values
*/
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "GL/osmesa.h"
#include "GL/glu.h"
#define WIDTH 600
#define HEIGHT 600
static GLboolean WriteFiles = GL_FALSE;
static GLboolean Gradient = GL_FALSE;
static void
Sphere(float radius, int slices, int stacks)
{
GLUquadric *q = gluNewQuadric();
gluQuadricNormals(q, GLU_SMOOTH);
gluSphere(q, radius, slices, stacks);
gluDeleteQuadric(q);
}
static void
Cone(float base, float height, int slices, int stacks)
{
GLUquadric *q = gluNewQuadric();
gluQuadricDrawStyle(q, GLU_FILL);
gluQuadricNormals(q, GLU_SMOOTH);
gluCylinder(q, base, 0.0, height, slices, stacks);
gluDeleteQuadric(q);
}
static void
Torus(float innerRadius, float outerRadius, int sides, int rings)
{
/* from GLUT... */
int i, j;
GLfloat theta, phi, theta1;
GLfloat cosTheta, sinTheta;
GLfloat cosTheta1, sinTheta1;
const GLfloat ringDelta = 2.0 * M_PI / rings;
const GLfloat sideDelta = 2.0 * M_PI / sides;
theta = 0.0;
cosTheta = 1.0;
sinTheta = 0.0;
for (i = rings - 1; i >= 0; i--) {
theta1 = theta + ringDelta;
cosTheta1 = cos(theta1);
sinTheta1 = sin(theta1);
glBegin(GL_QUAD_STRIP);
phi = 0.0;
for (j = sides; j >= 0; j--) {
GLfloat cosPhi, sinPhi, dist;
phi += sideDelta;
cosPhi = cos(phi);
sinPhi = sin(phi);
dist = outerRadius + innerRadius * cosPhi;
glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, innerRadius * sinPhi);
glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
glVertex3f(cosTheta * dist, -sinTheta * dist, innerRadius * sinPhi);
}
glEnd();
theta = theta1;
cosTheta = cosTheta1;
sinTheta = sinTheta1;
}
}
static void Cube(float size)
{
size = 0.5 * size;
glBegin(GL_QUADS);
/* +X face */
glNormal3f(1, 0, 0);
glVertex3f(size, -size, size);
glVertex3f(size, -size, -size);
glVertex3f(size, size, -size);
glVertex3f(size, size, size);
/* -X face */
glNormal3f(-1, 0, 0);
glVertex3f(-size, size, size);
glVertex3f(-size, size, -size);
glVertex3f(-size, -size, -size);
glVertex3f(-size, -size, size);
/* +Y face */
glNormal3f(0, 1, 0);
glVertex3f(-size, size, size);
glVertex3f( size, size, size);
glVertex3f( size, size, -size);
glVertex3f(-size, size, -size);
/* -Y face */
glNormal3f(0, -1, 0);
glVertex3f(-size, -size, -size);
glVertex3f( size, -size, -size);
glVertex3f( size, -size, size);
glVertex3f(-size, -size, size);
/* +Z face */
glNormal3f(0, 0, 1);
glVertex3f(-size, -size, size);
glVertex3f( size, -size, size);
glVertex3f( size, size, size);
glVertex3f(-size, size, size);
/* -Z face */
glNormal3f(0, 0, -1);
glVertex3f(-size, size, -size);
glVertex3f( size, size, -size);
glVertex3f( size, -size, -size);
glVertex3f(-size, -size, -size);
glEnd();
}
/**
* Draw red/green gradient across bottom of image.
* Read pixels to check deltas.
*/
static void
render_gradient(void)
{
GLfloat row[WIDTH][4];
int i;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1, 1, -1, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBegin(GL_POLYGON);
glColor3f(1, 0, 0);
glVertex2f(-1, -1.0);
glVertex2f(-1, -0.9);
glColor3f(0, 1, 0);
glVertex2f(1, -0.9);
glVertex2f(1, -1.0);
glEnd();
glFinish();
glReadPixels(0, 0, WIDTH, 1, GL_RGBA, GL_FLOAT, row);
for (i = 0; i < 4; i++) {
printf("row[i] = %f, %f, %f\n", row[i][0], row[i][1], row[i][2]);
}
}
static void
render_image(void)
{
static const GLfloat light_ambient[4] = { 0.0, 0.0, 0.0, 1.0 };
static const GLfloat light_diffuse[4] = { 1.0, 1.0, 1.0, 1.0 };
static const GLfloat light_specular[4] = { 1.0, 1.0, 1.0, 1.0 };
static const GLfloat light_position[4] = { 1.0, 1.0, 1.0, 0.0 };
static const GLfloat red_mat[4] = { 1.0, 0.2, 0.2, 1.0 };
static const GLfloat green_mat[4] = { 0.2, 1.0, 0.2, 1.0 };
static const GLfloat blue_mat[4] = { 0.2, 0.2, 1.0, 1.0 };
#if 0
static const GLfloat yellow_mat[4] = { 0.8, 0.8, 0.0, 1.0 };
#endif
static const GLfloat purple_mat[4] = { 0.8, 0.4, 0.8, 0.6 };
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHT0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 2.0, 50.0);
glMatrixMode(GL_MODELVIEW);
glTranslatef(0, 0.5, -7);
glClearColor(0.3, 0.3, 0.7, 0.0);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glRotatef(20.0, 1.0, 0.0, 0.0);
/* ground */
glEnable(GL_TEXTURE_2D);
glBegin(GL_POLYGON);
glNormal3f(0, 1, 0);
glTexCoord2f(0, 0); glVertex3f(-5, -1, -5);
glTexCoord2f(1, 0); glVertex3f( 5, -1, -5);
glTexCoord2f(1, 1); glVertex3f( 5, -1, 5);
glTexCoord2f(0, 1); glVertex3f(-5, -1, 5);
glEnd();
glDisable(GL_TEXTURE_2D);
glEnable(GL_LIGHTING);
glPushMatrix();
glTranslatef(-1.5, 0.5, 0.0);
glRotatef(90.0, 1.0, 0.0, 0.0);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
Torus(0.275, 0.85, 20, 20);
glPopMatrix();
glPushMatrix();
glTranslatef(-1.5, -0.5, 0.0);
glRotatef(270.0, 1.0, 0.0, 0.0);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
Cone(1.0, 2.0, 16, 1);
glPopMatrix();
glPushMatrix();
glTranslatef(0.95, 0.0, -0.8);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
glLineWidth(2.0);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
Sphere(1.2, 20, 20);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glPopMatrix();
#if 0
glPushMatrix();
glTranslatef(0.75, 0.0, 1.3);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, yellow_mat );
glutWireTeapot(1.0);
glPopMatrix();
#endif
glPushMatrix();
glTranslatef(-0.25, 0.0, 2.5);
glRotatef(40, 0, 1, 0);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glEnable(GL_CULL_FACE);
glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, purple_mat );
Cube(1.0);
glDisable(GL_BLEND);
glDisable(GL_CULL_FACE);
glPopMatrix();
glDisable(GL_LIGHTING);
glPopMatrix();
glDisable(GL_DEPTH_TEST);
}
static void
init_context(void)
{
const GLint texWidth = 64, texHeight = 64;
GLubyte *texImage;
int i, j;
/* checker image */
texImage = malloc(texWidth * texHeight * 4);
for (i = 0; i < texHeight; i++) {
for (j = 0; j < texWidth; j++) {
int k = (i * texWidth + j) * 4;
if ((i % 5) == 0 || (j % 5) == 0) {
texImage[k+0] = 200;
texImage[k+1] = 200;
texImage[k+2] = 200;
texImage[k+3] = 255;
}
else {
if ((i % 5) == 1 || (j % 5) == 1) {
texImage[k+0] = 50;
texImage[k+1] = 50;
texImage[k+2] = 50;
texImage[k+3] = 255;
}
else {
texImage[k+0] = 100;
texImage[k+1] = 100;
texImage[k+2] = 100;
texImage[k+3] = 255;
}
}
}
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0,
GL_RGBA, GL_UNSIGNED_BYTE, texImage);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
free(texImage);
}
static void
write_ppm(const char *filename, const GLubyte *buffer, int width, int height)
{
const int binary = 0;
FILE *f = fopen( filename, "w" );
if (f) {
int i, x, y;
const GLubyte *ptr = buffer;
if (binary) {
fprintf(f,"P6\n");
fprintf(f,"# ppm-file created by osdemo.c\n");
fprintf(f,"%i %i\n", width,height);
fprintf(f,"255\n");
fclose(f);
f = fopen( filename, "ab" ); /* reopen in binary append mode */
for (y=height-1; y>=0; y--) {
for (x=0; x<width; x++) {
i = (y*width + x) * 4;
fputc(ptr[i], f); /* write red */
fputc(ptr[i+1], f); /* write green */
fputc(ptr[i+2], f); /* write blue */
}
}
}
else {
/*ASCII*/
int counter = 0;
fprintf(f,"P3\n");
fprintf(f,"# ascii ppm file created by osdemo.c\n");
fprintf(f,"%i %i\n", width, height);
fprintf(f,"255\n");
for (y=height-1; y>=0; y--) {
for (x=0; x<width; x++) {
i = (y*width + x) * 4;
fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
counter++;
if (counter % 5 == 0)
fprintf(f, "\n");
}
}
}
fclose(f);
}
}
static GLboolean
test(GLenum type, GLint bits, const char *filename)
{
const GLint z = 16, stencil = 0, accum = 0;
OSMesaContext ctx;
void *buffer;
GLint cBits;
assert(bits == 8 ||
bits == 16 ||
bits == 32);
assert(type == GL_UNSIGNED_BYTE ||
type == GL_UNSIGNED_SHORT ||
type == GL_FLOAT);
ctx = OSMesaCreateContextExt(OSMESA_RGBA, z, stencil, accum, NULL );
if (!ctx) {
printf("OSMesaCreateContextExt() failed!\n");
return 0;
}
/* Allocate the image buffer */
buffer = malloc(WIDTH * HEIGHT * 4 * bits / 8);
if (!buffer) {
printf("Alloc image buffer failed!\n");
return 0;
}
/* Bind the buffer to the context and make it current */
if (!OSMesaMakeCurrent( ctx, buffer, type, WIDTH, HEIGHT )) {
printf("OSMesaMakeCurrent (%d bits/channel) failed!\n", bits);
free(buffer);
OSMesaDestroyContext(ctx);
return 0;
}
/* sanity checks */
glGetIntegerv(GL_RED_BITS, &cBits);
if (cBits != bits) {
fprintf(stderr, "Unable to create %d-bit/channel renderbuffer.\n", bits);
fprintf(stderr, "May need to recompile Mesa with CHAN_BITS=16 or 32.\n");
return 0;
}
glGetIntegerv(GL_GREEN_BITS, &cBits);
assert(cBits == bits);
glGetIntegerv(GL_BLUE_BITS, &cBits);
assert(cBits == bits);
glGetIntegerv(GL_ALPHA_BITS, &cBits);
assert(cBits == bits);
if (WriteFiles)
printf("Rendering %d bit/channel image: %s\n", bits, filename);
else
printf("Rendering %d bit/channel image\n", bits);
OSMesaColorClamp(GL_TRUE);
init_context();
render_image();
if (Gradient)
render_gradient();
/* Make sure buffered commands are finished! */
glFinish();
if (WriteFiles && filename != NULL) {
if (type == GL_UNSIGNED_SHORT) {
GLushort *buffer16 = (GLushort *) buffer;
GLubyte *buffer8 = (GLubyte *) malloc(WIDTH * HEIGHT * 4);
int i;
for (i = 0; i < WIDTH * HEIGHT * 4; i++)
buffer8[i] = buffer16[i] >> 8;
write_ppm(filename, buffer8, WIDTH, HEIGHT);
free(buffer8);
}
else if (type == GL_FLOAT) {
GLfloat *buffer32 = (GLfloat *) buffer;
GLubyte *buffer8 = (GLubyte *) malloc(WIDTH * HEIGHT * 4);
int i;
/* colors may be outside [0,1] so we need to clamp */
for (i = 0; i < WIDTH * HEIGHT * 4; i++)
buffer8[i] = (GLubyte) (buffer32[i] * 255.0);
write_ppm(filename, buffer8, WIDTH, HEIGHT);
free(buffer8);
}
else {
write_ppm(filename, buffer, WIDTH, HEIGHT);
}
}
OSMesaDestroyContext(ctx);
free(buffer);
return 1;
}
int
main( int argc, char *argv[] )
{
int i;
printf("Use -f to write image files\n");
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-f") == 0)
WriteFiles = GL_TRUE;
else if (strcmp(argv[i], "-g") == 0)
Gradient = GL_TRUE;
}
test(GL_UNSIGNED_BYTE, 8, "image8.ppm");
test(GL_UNSIGNED_SHORT, 16, "image16.ppm");
test(GL_FLOAT, 32, "image32.ppm");
return 0;
}
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